30-05-2012, 01:55 PM
Interacting with Devices
[attachment=23533]
I/O Alternatives
List two alternatives to the screen (CRT, LCD) as main computer output and the keyboard as main computer input device
what are critical properties of screen, keyboard?
what are the consequences for HCID?
Screen
Alternative 1:
Alternative 2:
Keyboard
Alternative 1:
Alternative 2:
Information transfer rates
Information transfer rates of popular I/O devices
output
computer screen
laser printer
loudspeakers
input
keyboard
mouse
microphone (speech input)
scanner
digital camera
Experiment: Combining Interaction
try to use two pointing devices simultaneously
e.g. mouse and trackpad on laptop
two mice on a desktop
Experiment 1: Move one device vertically, and the other horizontally.
What is the resulting movement of the cursor?
Could such a setup have advantages for certain tasks?
Experiment 2: Try pressing two different buttons on the two different devices simultaneously.
e.g. left button on the mouse, right button on the trackpad
What is the outcome?
Are there good uses of this setup?
Motivation
the devices used for input and output determine the nature and capacity of information transferred between human and computer
characteristics of the I/O devices influence user interface design to a large degree
the choice of an inappropriate or inadequate design will diminish the performance of the task
combinations of I/O devices can increase the usability of a system.
Input and Output Devices
I/O devices are hardware elements
connection between the physical human effectors (hands, vocal cords) and sensors (eyes, ears), and the input and output channels of computers
also enable communication between users and software
usually their properties and behavior can be adapted through software
task demands and user preferences affect the choice of input and output devices to use
e.g. the need for hands-free or silent operation
special devices or setups for users with disabilities
Overview Input Devices
need to specify the objects and actions of interaction
what should be done
how can it be done
logical equivalence of input devices
different devices can be used for the same input tasks
examples
mouse, trackpad, pen
mouse, cursor keys
keyboard, pen
keyboard, microphone with speech recognition.
[attachment=23533]
I/O Alternatives
List two alternatives to the screen (CRT, LCD) as main computer output and the keyboard as main computer input device
what are critical properties of screen, keyboard?
what are the consequences for HCID?
Screen
Alternative 1:
Alternative 2:
Keyboard
Alternative 1:
Alternative 2:
Information transfer rates
Information transfer rates of popular I/O devices
output
computer screen
laser printer
loudspeakers
input
keyboard
mouse
microphone (speech input)
scanner
digital camera
Experiment: Combining Interaction
try to use two pointing devices simultaneously
e.g. mouse and trackpad on laptop
two mice on a desktop
Experiment 1: Move one device vertically, and the other horizontally.
What is the resulting movement of the cursor?
Could such a setup have advantages for certain tasks?
Experiment 2: Try pressing two different buttons on the two different devices simultaneously.
e.g. left button on the mouse, right button on the trackpad
What is the outcome?
Are there good uses of this setup?
Motivation
the devices used for input and output determine the nature and capacity of information transferred between human and computer
characteristics of the I/O devices influence user interface design to a large degree
the choice of an inappropriate or inadequate design will diminish the performance of the task
combinations of I/O devices can increase the usability of a system.
Input and Output Devices
I/O devices are hardware elements
connection between the physical human effectors (hands, vocal cords) and sensors (eyes, ears), and the input and output channels of computers
also enable communication between users and software
usually their properties and behavior can be adapted through software
task demands and user preferences affect the choice of input and output devices to use
e.g. the need for hands-free or silent operation
special devices or setups for users with disabilities
Overview Input Devices
need to specify the objects and actions of interaction
what should be done
how can it be done
logical equivalence of input devices
different devices can be used for the same input tasks
examples
mouse, trackpad, pen
mouse, cursor keys
keyboard, pen
keyboard, microphone with speech recognition.